From mboxrd@z Thu Jan 1 00:00:00 1970 Date: Mon, 20 Dec 1999 14:29:59 -0500 (EST) From: James Simmons To: Geert Uytterhoeven cc: linuxppc-dev@lists.linuxppc.org Subject: Re: PowerPC kernel bug. (fwd) Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-linuxppc-dev@lists.linuxppc.org List-Id: Geert I know you work with the PowerPC people. I don't belong to the list so it might not go threw. So could you post it as well. Subject: PowerPC kernel bug. Date: Mon, 13 Dec 1999 22:03:26 -0500 (EST) From: James Simmons To: GLX mailing list , FrameBuffer List , Linux Kernel Mailing List This message is toward the Fbdev/kernel group to fix this bug but I wanted to let the GLX group what caused the memset problem on PowerPC. On a PowerPC when you mmap the framebuffer and use memset on the mmapped image you get a SIGBUS. Thanks Marcus for finding out what was causing the problem. >I noticed today that it's actually a bug in the PPC-kernel. The >specification for the dcbz (data cache block zero) instruction >states that for uncached memory the exception handler should clear >the memory, but on Linux it just causes a SIGBUS to be sent to the >app... ----------- ============== ** Sent via the linuxppc-dev mail list. See http://lists.linuxppc.org/